The Battle of Chios () was fought in 201 BC between the fleet of Philip V of Macedon against the combined fleet of Rhodes, Pergamum, Byzantium and Cyzicus. The Cretan War had started in 205 BC when the Macedonians and their pirate and Cretan allies had started attacking Rhodian ships as Rhodes had the richest merchant fleet in the Aegean. The navies of Rhodes' allies Pergamum, Byzantium and Cyzicus joined the Rhodian fleet and then defeated the Macedonian fleet off Chios.